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POVariable scope in multithreading, why my object reference is lost?
 

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  1. POVariable scope in multithreading, why my object reference is lost?
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    <p>Briefly under a single producer - single consumer scenario, I used a mutable object for synchronization and passing data and messages between producer and consumer. Shared buffer is a <code>ConcurrentQueue</code> of byte arrays. To implement a circular buffer and prevent heap fragmentation and frequent object swapping by <code>GC</code> I used a <code>ConcurrentBag</code> of byte arrays as a recycle-bin for used byte arrays. <code>ManualResetEventSlim</code> is used for thread synchronization. Sometimes I lose reference to byte arrays in my code. Below is a simplified version of my code in case you need more details but I guess this is a routine mistake while working with threads.</p> <pre><code>MutableObject mutableObject = new MutableObject(); Producer producer = MutableObject.GetProducer(); Consumer consumer = MutableObject.GetConsumer(); Thread fork = new Thread(new ThreadStart(producer.Start)); // Forking execution path fork.Start(); // Main thread goes here consumer.Start(); class MutableObject() { private Producer m_producer; private Consumer m_consumer; private ConcurrentBag&lt;byte[]&gt; m_recycleBin = new ConcurrentBag&lt;byte[]&gt;(); private ConcurrentQueue&lt;byte[]&gt; m_sharedBuffer = new ConcurrentQueue&lt;byte[]&gt;(); public Producer GetProducer() { // Keep a reference to the mutable object return new Producer(this); } // GetConsumer() method is just like GetProducer() method public void GetEmptyBuffer(out byte[] buffer) { if (!m_recycleBin.TryTake(out buffer)) buffer = new byte[1024]; } public bool Put(byte[] buffer) { m_sharedBuffer.Enqueue(buffer); // Set ManualResetEventSlim for consumer } public bool Get(byte[] buffer) // Consumer calls this method in a loop { m_sharedBuffer.TryDequeue(out buffer); // I save a reference to buffer here and pass it to recyclebin at next call like this: lastBuffer = buffer; // This is because buffers are passing by refrence for I should wait until it would be used by consumer. m_recycleBin.Add(lastBuffer); // Set ManualResetEventSlim for producer } } class Producer { private MutableObject m_mutableObject; public Producer(MutableObject mutableObject) { m_mutableObject = mutableObject; } public void Start() { byte[] buffer; while (true) { m_mutableObject.GetEmptyBuffer(out buffer); m_mutableObject.Put(buffer); } } } </code></pre> <p>Actually <code>GetEmptyBuffer()</code> method frequently creates new buffers and although used buffers are stored in recycle-bin, the recycle-bin count doesn't raise sometimes !</p>
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    1. USXaqron
    1. USXaqron
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      1. POVariable scope in multithreading, why my object reference is lost?
      1. USAbdullahC
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    1. COIf I where you, I'd worry about heap fragmentation etc, once I got the code *working*.
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      1. POVariable scope in multithreading, why my object reference is lost?
      1. USaioobe
    2. COWhen does the recylceBin get emptied?
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      1. POVariable scope in multithreading, why my object reference is lost?
      1. USConrad Frix
    3. COIs this code actually working? As I see it, it should not compile.
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      1. POVariable scope in multithreading, why my object reference is lost?
      1. USPeter Knego
 

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